My Inquiry
My Account
Renesas ISL9104AIRUCZ-T
- Part No.:
- ISL9104AIRUCZ-T
- Manufacturer:
- Renesas
- Package:
- 6-UFDFN
- Datasheet:
-
ISL9104AIRUCZ-T.pdf
- Description:
- IC REG BUCK 1.8V 500MA 6UTDFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,217
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ISL9104AIRUCZ-T from Intersil is a 500mA, 4.3MHz synchronous buck converter optimized for low-voltage microprocessors in space-constrained portable devices. It delivers fixed 1.8V output from 2.7–6.0V input, features 20µA quiescent current in skip mode, 100% duty-cycle operation for <300mV dropout at 500mA, and integrated P/N-channel MOSFETs. It powers baseband processors in WCDMA handsets requiring high light-load efficiency and ultrasonic switching.
For engineers reviewing the ISL9104AIRUCZ-T datasheet, ISL9104AIRUCZ-T pinout, ISL9104AIRUCZ-T application, or ISL9104AIRUCZ-T equivalent, key selection criteria include its 1.8V fixed output, ultrasonic skip-mode operation (eliminating audible noise), 1.6×1.6mm µTDFN package, and guaranteed 500mA output with internal soft-start and output discharge.
Technical Context
The ISL9104AIRUCZ-T employs peak-current-mode PWM control with slope compensation for fast transient response and pulse-by-pulse current limiting. Its architecture integrates a 0.8V bandgap reference, transconductance error amplifier, and zero-cross sensing circuit to enable automatic transition between fixed-frequency PWM (heavy load) and ultrasonic pulse-skipping (PFM) mode (light load).
It implements 100% duty-cycle low-dropout operation using an internal P-channel MOSFET (0.45Ω typical RDS(on) at 3.6V), paired with an N-channel MOSFET (0.4Ω typical) and a dedicated bleeding FET for rapid output capacitor discharge upon disable. Thermal shutdown activates at +130°C with 30°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±3% over line/load/temperature - ensures stable core voltage for 1.8V I/O or processor domains. |
| Max Output Current | 500mA guaranteed - supports mid-tier application processors and RF ICs in cellular handsets. |
| Switching Frequency | 4.3MHz (3.6–4.9MHz range) - enables use of 1.0µH inductor and compact 0603 capacitors, minimizing PCB area. |
| Quiescent Current | 20µA typical in skip mode - extends battery runtime in standby/sleep states of portable equipment. |
| Shutdown Current | <1µA logic-controlled - prevents battery drain during system off-state. |
| Duty Cycle | 100% maximum - maintains regulation down to VIN = VOUT + dropout (~2.1V min for 1.8V out), maximizing single-cell Li+ utilization. |
| UVLO Threshold | 2.5V (rising), 50mV hysteresis - prevents erratic startup during battery sag and ensures clean power-on reset. |
Pinout & Package
ISL9104AIRUCZ-T is housed in a RoHS-compliant, 6-pin 1.6mm × 1.6mm µTDFN package with wettable flanks, optimized for thermal performance (θJA = 160°C/W) and automated optical inspection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Input supply rail | Accepts 2.7–6.0V; requires local 4.7µF ceramic decoupling to minimize high-frequency switching noise injection. |
| EN (Pin 2) | Logic-enable control | Active-high (1.4V min); asserts internal soft-start and enables output discharge when pulled low. |
| NC (Pin 3) | No-connect | Internally unconnected; must be left floating per datasheet - no external tie required. |
| FB (Pin 4) | Feedback reference node | Internally tied to 1.8V output for fixed version; not user-configurable - eliminates external resistor divider. |
| GND (Pin 5) | Power ground return | Primary thermal and current return path; must be connected to solid ground plane under IC footprint. |
| SW (Pin 6) | Switching node | Connects to inductor high-side; carries high di/dt square wave - requires short, wide trace to minimize EMI and voltage spikes. |
Key Features
| Feature | Design Value |
|---|---|
| Ultrasonic skip-mode operation | Eliminates audible coil whine in handhelds by shifting PFM frequency above 20kHz - confirmed for ISL9104A variant only. |
| Integrated P/N-channel MOSFETs | Reduces BOM count by two discrete switches and enables 93% peak efficiency at 500mA - measured at VOUT=1.8V, VIN=3.6V. |
| Internal digital soft-start | 1ms controlled ramp limits inrush current and prevents output overshoot during power-up sequencing. |
| Output capacitor quick-bleed function | Discharges VOUT to <100mV within 1ms after EN deactivation - critical for safe hot-swap and multi-rail sequencing. |
| Overtemperature & short-circuit protection | Thermal shutdown at +130°C (30°C hysteresis) and SCP reduces oscillator frequency during FB undervoltage - prevents latch-up or damage. |
Applications
| Mobile Baseband Power | WCDMA Transceiver Bias |
|---|---|
Use Scenario: Powers ARM9/ARM11 application processors and modem subsystems in dual-mode WCDMA/GSM handsets. IC Role / Device Role / Timing Role: Primary 1.8V core regulator delivering up to 500mA with dynamic load step response <50µs. Use Value: Ultrasonic skip mode prevents audible noise during voice call standby; 100% duty cycle extends talk time as battery discharges from 4.2V to 3.2V. | Use Scenario: Supplies bias voltage to RF power amplifiers and analog front-end ICs in WCDMA handset RF sections. IC Role / Device Role / Timing Role: Low-noise, fast-transient point-of-load regulator synchronized to PA enable timing via EN pin. Use Value: Quick-bleed function ensures RF section resets cleanly before next transmission burst; 4.3MHz switching avoids interference with 2.1GHz UMTS band. |
| Portable Media Player Core | Low-Power MCU Subsystem |
Use Scenario: Generates 1.8V for NAND flash controllers and audio codecs in MP3 players with OLED displays. IC Role / Device Role / Timing Role: High-efficiency DC-DC converter operating in skip mode during music playback pause or display sleep. Use Value: 20µA quiescent current minimizes battery drain during 100+ hour standby; small 1.6×1.6mm footprint saves space for battery expansion. | Use Scenario: Powers 1.8V I/O and core rails of ultra-low-power MCUs (e.g., ARM Cortex-M0+) in sensor hubs and wearable health monitors. IC Role / Device Role / Timing Role: Always-on regulator supporting RTC and wake-on-interrupt functions with sub-µA shutdown leakage. Use Value: <1µA shutdown current enables multi-month operation on coin-cell batteries; EN pin allows precise MCU-controlled power gating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRYR | 3MHz switching, 300mA rated, 1.8V fixed, 17µA IQ - smaller current rating, lower fSW, no ultrasonic PFM. | Suitable for lower-current MCU cores but not 500mA baseband loads; lacks audible-noise suppression. | Select when cost sensitivity outweighs 500mA headroom and ultrasonic operation. |
| RT8059GJ6 | 2.5MHz fSW, 600mA rated, 1.8V fixed, 22µA IQ, no ultrasonic PFM - higher current, same IQ, different frequency. | Compatible for space-constrained 1.8V rails but may generate audible noise under light load in quiet environments. | Choose for marginally higher output current where ultrasonic silence is non-critical. |
Compared with TPS62231DRYR and RT8059GJ6, the ISL9104AIRUCZ-T uniquely combines 500mA capability, 4.3MHz operation for minimal passive size, and ultrasonic skip mode - making it optimal for noise-sensitive, battery-powered WCDMA handset applications demanding both performance and acoustic stealth.
Availability
ISL9104AIRUCZ-T is available at Aetrix Electronics and suitable for mobile handset power management, portable media player subsystems, and low-power MCU applications requiring stable component supply across production lifecycles.
Supply support for ISL9104AIRUCZ-T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Intersil Corporation designs high-performance analog semiconductors for power management and signal processing in portable electronics, flat-panel displays, and communications infrastructure.
The ISL9104A product line targets compact, battery-operated devices requiring high-efficiency, low-noise, and space-optimized DC-DC conversion - specifically addressing the needs of 3G/4G handset baseband and RF power stages.
FAQ
What is the output voltage tolerance of the ISL9104AIRUCZ-T over temperature and line conditions?
The ISL9104AIRUCZ-T provides ±3% output voltage accuracy over the full operating temperature range (−40°C to +85°C) and input line variation (2.7V to 6.0V). This specification applies specifically to the fixed 1.8V version and is guaranteed by design - ensuring reliable operation for 1.8V I/O interfaces without external trimming. The ISL9104AIRUCZ-T achieves this via precision internal feedback and bandgap reference circuitry.
Does the ISL9104AIRUCZ-T support ultrasonic operation, and how is it enabled?
Yes, the ISL9104AIRUCZ-T supports ultrasonic skip-mode operation - a feature exclusive to the ISL9104A family (denoted by "A" in the part number). It automatically shifts pulse-skipping frequency above 20kHz under light load to eliminate audible coil whine. No external configuration is needed; the function is hardwired and active whenever the ISL9104AIRUCZ-T enters skip mode. This behavior is confirmed in the FN6829 datasheet Rev 5.00, Feature list, and Ordering Information table.
What is the minimum input voltage required for the ISL9104AIRUCZ-T to maintain 1.8V output at 500mA?
The ISL9104AIRUCZ-T maintains 1.8V output at 500mA down to a minimum input voltage determined by dropout: VIN(min) = VOUT + IOUT × RDS(on)_PCH. With typical P-channel RDS(on) of 0.45Ω at 3.6V (and higher at lower VIN), dropout is <300mV at 500mA - so VIN(min) ≈ 2.1V. This 100% duty-cycle capability maximizes usable capacity from a single Li+ cell. The ISL9104AIRUCZ-T datasheet specifies 2.7V as the recommended minimum for full regulation, but dropout operation extends functional range lower.
How does the quick-bleed function work on the ISL9104AIRUCZ-T, and what is its discharge time?
The ISL9104AIRUCZ-T integrates a dedicated N-channel bleeding MOSFET that activates when the EN pin is driven low. It discharges the output capacitor through a low-impedance path, reducing VOUT to <100mV within 1ms - verified in typical operating waveforms (Figure 8–10). This ensures safe, rapid power-down for multi-rail sequencing and prevents back-powering of upstream circuitry. The ISL9104AIRUCZ-T's bleeding FET has a typical RDS(on) of 100Ω, enabling controlled yet fast discharge without excessive stress.
Can the ISL9104AIRUCZ-T be used with an adjustable-output configuration?
No, the ISL9104AIRUCZ-T is a fixed 1.8V output variant - its FB pin is internally connected to the output, eliminating the need for external resistors. Adjustable versions (e.g., ISL9104AIRUAZ-T) exist but require external R1/R2 dividers and differ in marking and functionality. Using the ISL9104AIRUCZ-T in an adjustable circuit will result in incorrect regulation, as the internal feedback network is disabled only in ADJ variants. The datasheet Pin Descriptions explicitly state FB is "directly connected to the converter output" for fixed versions like ISL9104AIRUCZ-T.
ISL9104AIRUCZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 6-UFDFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- -
- Current - Output:
- 500mA
- Frequency - Switching:
- 4.3MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-UTDFN (1.6x1.6)
ISL9104AIRUCZ-T FAQ
1.How can I place an order for ISL9104AIRUCZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL9104AIRUCZ-T on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ISL9104AIRUCZ-T reliable?
The price and inventory of ISL9104AIRUCZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL9104AIRUCZ-T is usually 5 days.
3.What payment methods are accepted for ISL9104AIRUCZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL9104AIRUCZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL9104AIRUCZ-T?
ISL9104AIRUCZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL9104AIRUCZ-T order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ISL9104AIRUCZ-T?
For technical support, including ISL9104AIRUCZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL9104AIRUCZ-T requirements.
6.How does Aetrix verify that ISL9104AIRUCZ-T is sourced from the original manufacturer or authorized distributors?
All ISL9104AIRUCZ-T products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ISL9104AIRUCZ-T meets industry standards.
7.What is the process for return or replacement of ISL9104AIRUCZ-T?
All ISL9104AIRUCZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL9104AIRUCZ-T, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ISL9104AIRUCZ-T part is unused and in its original packaging.
Return procedure for ISL9104AIRUCZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ISL9104AIRUCZ-T Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
